Side mount stern drive

ABSTRACT

Disclosed herein is a marine propulsion device in which a drive shaft housing having upper and lower housing sections projects through an opening in the transom of a boat hull and is rotatably supported for vertical movement about a horizontal tilt axis by a fixed housing on the inboard side of the transom. The lower housing section includes a gearcase with a propeller shaft and a projecting portion which extends through the hollow interior of the upper housing extension into an access area in the fixed housing where it is connectable to steering apparatus. Interchangeable components permit the engine to be mounted on either the port or starboard sides of the transom. At each of these locations, various engine-mounting positions are afforded by a planetary engine-mounting arrangement.

United States Patent [72] Inventor William J. Shimanckas Waukegan, Ill.[21] Appl. No. 811,829 [22] Filed Apr. 1, 1969 [45] Patented June 8,1971 [73] Assignee Outboard Marine Corporation Waukegan, Ill.

[54] SIDE MOUNT STERN DRIVE 19 Claims, 9 Drawing Figs.

[52] US. Cl 115/41 [51] B63h 5/12 [50] Field 01 Search 115/41,17, 34;74/397, 396, 606, 421

[56] References Cited UNITED STATES PATENTS 2,499,339 2/1950 Wanzer115/41 2,644,434 7/1953 Watkins 115/17 X 2,700,359 l/1955 Dewhurst115/41 X 3,182,629 5/ 1965 Armantrout et al. 115/41 3,303,365 4/1967Hennessey 3,489,120 l/l970 Strang Primary ExaminerMilton BuchlerAssistant Examiner-Carl A. Rutledge Attorneys-Michael, Best & Friedrich,Spencer B. Michael and Robert K. Gerling ABSTRACT: Disclosed herein is amarine propulsion device in which a drive shaft housing having upper andlower housing sections projects through an opening in the transom of aboat hull and is rotatably supported for vertical movement about ahorizontal tilt axis by a fixed housing on the inboard side of thetransom. The lower housing section includes a gearcase with a propellershaft and a projecting portion which extends through the hollow interiorof the upper housing extension into an access area in the fixed housingwhere it is connectable to steering apparatus. Interchangeablecomponents permit the engine to be mounted on either the port orstarboard sides of the transom. At each of these locations, variousenginemounting positions are afforded by a planetary engine-mountingarrangement.

PATENTED JUN 8 1971 SHEET 1 0F 4 fpggl rroauaws PATENTED JUN 8197! SHEET.3 [1F 4 mv an TOR wmunm J. Sal/newer:

SIDE MOUNT STERN DRIVE BACKGROUND OF INVENTION The invention relates tomarine propulsion devices of the type which are commonly called sterndrive or inboard-outboard propulsion units and in which the engine ismounted forwardly of the transom and power is supplied to a propellereither through the transom or over the transom.

SUMMARY OF INVENTION The invention provides a marine propulsion devicein which steering of the boat hull is afforded by rotation of the lowerhousing section of a drive shaft housing having upper and lower housingsections. The lower housing section supports a propeller shaft andpropeller.

External steering links or connections to the lower housing section areeliminated by a construction in which the lower housing section isprovided with a hollow or tubular projecting portion which surrounds thedrive shaft, and which is journaled in the hollow interior of the upperhousing section. The projecting portion extends into a cavity or accessarea in a fixed housing which is connected to the inboard side of a boattransom. Rotation of the upper end of the projecting portion to turn thelower housing section about the axis of the drive shaft to steer theboat is afforded by a pulley and belt arrangementor by gears whichconnect the lower housing section to a steering shaft which can beconnected to conventional remote steering apparatus.

The invention also provides means for interchangeably locating theengine on either the port or starboard side of the transom toaccommodate the various seat and cockpit arrangements in a boat hull.This means includes two bushings which have symmetrical annular surfaceportions and which can be interchangeably received in either of twocoaxial apertures in the fixed housing which supports the drive shafthousing on the transom for vertical tilting movement about a horizontaltilt axis. The bushings are connected to the upper end or inboard end ofthe upper section of the drive shaft housing to rotatably support thedrive shaft housing to the transom. One of the bushings has a greateraxial length than the other and projects through the sidewall of thefixed housing and rotatably supports the steering shaft. The bushingsalso carry bearings for supporting a horizontal cross-shaft which iscoaxial with the horizontal tilt axis of the drive shaft housing andwhich is connected to the drive shaft through gears. One end of thehorizontal cross-shaft is connected to the engine output shaft by gears.By interchanging the bushings, the steering shaft can be located on oneside of the fixed housing and the gears for connection of thecross-shaft to the engine output shaft can be located on the other sideof the fixed housing.

Inasmuch as the steering shaft is supported in one of the bushings whichrotates upon vertical tilt of the drive shaft housing, the steeringshaft remains in the same location relative to the projecting portion ofthe lower housing section, thus there is no twisting of the belt duringtilting movement of the housing. Furthermore, the steering ratio remainsconstant during tilting movement of the drive shaft housing.

The direction of rotation of the drive shaft can be changed by axiallyshifting a clutch dog which is splined to the crossshaft and engageablewith either of two bevel gears carried by the cross-shaft.

In addition to the provision for interchangeably locating the engine oneither the port or starboard side of the transom, the invention alsoprovides means for mounting one end of the engine to the fixed housingto afford a plurality of mounting positions of the engine and inplanetary relation to the horizontal tilt axis and cross-shaft. Thus theheight of the engine above the floorboard and the distance of the enginefrom the transom can be varied.

Means are also provided for adjustably mounting the other end of theengine to the transom. The invention also includes apparatus forprealignment of the means for adjustably mounting the other end of theengine prior to installation of the engine.

Further objects and advantages of the invention will become apparentfrom the following description and accompanying drawings.

DESCRIPTION OF DRAWINGS FIG. 1 is a side elevational view of the marinepropulsion unit of the invention which is partially broken away and isin fragmentary section.

FIG. 2 is a front elevational view of the marine propulsion unit shownin FIG. 1 with the boat hull in fragmentary section.

FIG. 3 is a view taken along line 3-3 of FIG. 2.

FIG. 4 is a fragmentary sectional view taken along line 44 of FIG. 2.

FIG. Sis a view taken along line 5-5 of FIG. 2.

FIG. 6 is a view showing an alternate arrangement for the steeringmeans.

FIG. 7 is a view of the motor mounting arrangement with apparatus foralignment of the mountings.

FIG. 8 is a sectional view taken along line 8-8 of FIG. 5.

FIG. 9 is a sectional view taken along line 9-9 of FIG. 8.

DETAILED DESCRIPTION Referring to FIG. I there is shown a stern drive ormarine propulsion device in accordance with the invention, which isgenerally designated 2, and which is shown mounted on the transom 4 ofaboat hull 6. The marine propulsion device 2 includes a drive shaft 7rotatably supported in an outboard leg, propulsion unit or drive shafthousing 8 which includes a first part or lower housing section 10 and asecond part or upper housing section 12. The lower housing section 10includes a lower unit gearcase 11 which rotatably supports a propellershaft 9 which carries a propeller 13. The gearcase 11 is separated fromthe upper part of the lower housing section by a gasket 11A. Thepropeller shaft 9 is connected to the drive shaft 7 by a pair of bevelgears 13A and 14A.

To facilitate steering, the lower housing section 10 is provided with anaxial extension or projecting wall portion 16 which extends upwardlyfrom an inturned wall portion 15 and through the hollow interior 17 ofthe upper housing section 12. The means provided to rotate theprojecting portion 16 and lower housing section 10 to steer the hull aresubsequently described.

The lower housing section 10 also has an annular wall portion 18 whichis connected to wall portion 15 and which surrounds the drive shaft andextends through the interior 19 of the lower housing section 10. Thewall portion 18 carries bearings 19A for rotatably supporting the driveshaft 7.

The lower housing section 10 is rotatably supported in a bearing 20 inthe upper housing section 12. The bearing 20 (FIG. 1) is located betweenthe projecting portion 16 of the lower housing section 10 and portionsof an outer wall 21 and intermediate wall 21A of the upper housingsection 12.

In accordance with the invention, means are provided for rotatablysupporting the drive shaft housing 8 on a boat hull for swinging ortilting movement in a vertical plane about a generally horizontal tiltaxis. In the disclosed construction, the means includes a fixed housingor support or structure 22 in the form of a rearwardly open shell orenclosure with spaced sidewalls 23, 24, (FIG. 2) interconnected by anintermediate wall 25.

Means are provided for securing the fixed housing 22 to the transom 4.As disclosed, the means includes out-turned flanges 26 (FIGS. 1, 2)which extend from the edges of the intermediate wall 25 and of thesidewalls 23, 24, a clamping member 27 which has an out-turned flange 29(FIG. I) located on the aftward or outboard side of the transom 4, and aportion 30 which projects through the transom opening 31. The flanges 26are secured to the clamping member 27 by bolts 32 (FIGS. 1, 2).

To rotatably support the drive shaft housing 8, the sidewalls 23, 24 ofthe fixed housing 22 are provided with coaxial apertures 33, 34 (FIG. 8)defined by annular flanges 35 and 36. The upper end 36A of the upperhousing section 12 is located between the sidewalls 23, 24 and isprovided with two coaxial apertures 37 and 38, respectively, defined byannular flanges 39 and 40 having stepped shoulders 41 and 42 (FIG. 8).The stepped shoulders 41 and 42 are separated from the surfaces 35 and36 of the fixed housing 22 by bearings 44 and 46.

To support the upper end 36A of the upper housing section 12 in theapertures 33, 34, the invention provides first and second members orbushings 47 and 48 which have symmetrical annular wall portions 49 and50 which can be received or journaled in either of the apertures 33, 34of the fixed housing 22. As is disclosed in FIG. 8, bushing 47 islocated in aperture 33. The symmetry of portions 49 and 50 permits themounting of an engine on either the port or starboard sides of thetransom, as will be subsequently described in detail. The bushing 48 issecured to flange 40 of the upper housing section 12 by a series ofbolts 49A. The bushing 47 is secured to the flange 39 by bolts 49A.Thus, the bushings 47, 48 rotate with the propulsion unit or drive shafthousing 8 when it is tilted as for instance when the boat is beached orbeing trailed.

The bushings 47, 48 respectively, have cup-shaped receptacles 50, 51which receive the bearings 52 and 53 which rotatably support across-shaft 54 in coaxial relation to the horizontal tilt axis of thepropulsion unit 8.

Means are provided for rotating the lower housing section 10 about theaxis of the drive shaft 7 to afford steering of the boat hull. Asdisclosed, the means includes a member 60 (FIG. 8) which is connected tothe upper end of the projecting portion 16 by bolts 62. Member 60 isprovided with an axially extending annular flange 64 which has anexterior annular groove 65 and an interior concentric bore 66 whichcarries a bearing 67 for rotatably supporting the upper end of the driveshaft 7.

The means for rotating the lower housing section 10 also includes asteering shaft 68 (FIGS. 5, 8, 9) which is rotatably supported in thebushing 47 by bearings 69 for rotation about an axis which isperpendicular or transverse to the cross-shaft 54 and parallel to thedrive shaft 7. The steering shaft 68 carries a pulley 70 which isconnected to the member 60 by a band or belt 72. The belt 72 and themember 60 are provided with means for preventing relative movementtherebetween.

Various arrangements can be used. In the disclosed construction, thebelt 72 is provided with a projection 73 (FIG. which is located in atransverse notch 74 in the groove 65 to afford a positive engagementwith the belt 72. The ends of belt 72 can be connected to the pulley 70as shown in FIG. 5.

Alternatively, as shown in FIG. 6, the connection between shaft 68 andthe projecting portion 16 of the lower housing section can be affordedby gears. As disclosed, a gear segment 70A is connected to the steeringshaft 68 and a gear segment 65A is connected to the upper end ofprojection portion 16. The gear segments 70A and 65A are connected by anidler gear 71A. Rotation of the shaft 68 to provide steering isfacilitated by a steering arm 74 (FIGS. 2, 8) secured to the shaft 68and connectable to a conventional steering cable or apparatus (notshown). Inasmuch as the steering shaft 68 tilts with the drive shafthousing, the steering ratio between the steering shaft 68 and theprojecting portion remains constant.

In addition to provision for locating the engine on either the port orstarboard sides of the transom 4, the invention also provides means formounting one end of the engine 80 to the fixed housing 22 to afford aplurality ofengine-mounting positions in planetary or orbital relationto the horizontal crossshaft 54 and the horizontal tilt axis. Sucharrangement facilitates mounting of the propulsion device 2 on transomshaving various angles and heights with respect to the water surface. Thecockpit arrangements and seat locations vary considerably in boatsproduced by different manufacturers so considerable flexibility inengine-mounting arrangements is desirable.

In the disclosed construction (FIGS. 3, 5, and 7) the means for mountingthe engine to afford a plurality of mounting positions includes a firstengine-mounting member 92 which is secured to the fixed housing and acooperating second mounting member 82 which is mounted, as will bedescribed, to the first mounting member. The second mounting member isprovided with a series of circumferentially arranged apertures 84 and acentral aperture 86 for receiving a stub shaft 88 which carries a gear90. The other end of the stub shaft 80 is journaled in the first enginemounting member 92.

The second mounting member 82 is also provided with two resilient mountsor pads 94 and 96 (FIGS. 2 and 3) which are connected to and support oneend of the engine 80. The second mounting member 82 is in overlappingrelation to the first mounting member 92 and is in planetary relation tothe cross-shaft 54. The second mounting member 82 is secured to thefirst mounting member 92 by bolts 97 (FIG. 5) which extend through theapertures 84 (FIG. 3) and are receivable in a plurality of apertures 98which are circumferentially arranged around the periphery of the firstmounting member 92. To mount the engine in the desired location,mounting member 82 is rotated about the axis of the stub shaft 88 andthe mounting member 92 is rotated about the axis of the cross-shaft 54until the apertures 84 are in alignment with some of the apertures 98.The bolts 97 are then threaded into the apertures 98. The bolts 99 whichextend through apertures 98 are tightened to secure member 92 to thefixed housing 22. Rotation of mounting members 82 and 92 in this mannermaintains the stub shaft 88 at the same radial distance from thecross-shaft 54 thus keeping gear in mesh with the gear 91 carried by thecross-shaft 54. FIGS. 1 and 2 show in broken lines the engine mounted inan alternate position.

Means are provided for adjustably mounting the other side or rear of theengine to the transom 4 to afford fore-and-aft engine adjustment. In thedisclosed construction (FIG. 4) the means comprises a bracket which issecured to the transom by bolts 112. The fixed bracket 110 is providedwith a slide 114 which travels in a guide or way 116 formed by opposedflanges 118 and 120. One end of the slide is provided with a resilientengine mount 122 (FIGS. 4, 5 and 7) which carries an outwardlyprojecting stud 124. The stud 124 extends through an aperture 129 in theengine flywheel cover 125 and is secured thereto by a nut 129A. Themount 122 has a second outwardly projecting stud 127 which extendsthrough a square aperture 128A in the slide 114 and is secured to theslide 114 by a nut 130A.

The invention also provides apparatus for prealignment of theengine-mounting bracket 110 prior to connection of the engine 80 toengine-mounting member 82 by the use of an alignment rod 132 (FIG. 7)which projects into coaxial aperture 134 in stub shaft 88. The slide 114is adjusted so that the pointed end 136 of the alignment shaft 132 iscentered in the aperture 128A.

The drive train for rotating propeller shaft 12 and propeller 13includes a coupling 142 (FIG. 5) which connects the engine output shaft138 to the stub shaft 88. Stub shaft 88 carries the gear 90 which mesheswith the gear 91 carried by the cross-shaft 54.

A water pump 158 including a pump body for supplying engine-coolingwater (FIGS. 2 and 3) is driven by a pulley 152 located at one end ofshaft 54 and a flexible belt 154. Means are provided for swingablymounting the body of the water pump to the water inlet pipe 151 (FIGS. 1and 2) to tighten the belt 154. The means is in the form of a bolt 155.Alternatively, the pump 150 can be mounted on the engine 80. In thelatter arrangement, the pump will move as the engine position isshifted, thus the need for a flexible hose 157 (FIG. 3) between the pump150 and the engine 80 is eliminated.

The drive train also includes means for reversing the direction ofrotation of the drive shaft 7. As shown in FIGS. 8 and 9, the meansincludes a pair of bevel gears 156 and 158 which are rotatably carriedby shaft 54 and which mesh with a bevel gear 160 connected to the upperend of the drive shaft 7. Forward and reverse propeller rotation iseffected by moving an axially shiftable clutch dog 164 which is splinedto shaft 54. The clutch dog can be shifted either mechanically,pneumatically, hydraulically or electromechanically as disclosed inpending application Ser. No. 627,106.

Tilting movement of the drive shaft housing 8 about the horizontal tiltaxis is afforded by a power tilt cylinder and shock absorber 172(FIG. 1) which is located within housing 22 and which has a pistonconnected at 174 to the upper housing section 12 and the cylinderconnected at 176 to the fixed housing 22 (FIGS. 1 and 5). The cylinder172 is connected to a hydraulic pump 178.

The engine 80 can be balanced by a battery 180 (FIGS. 2, 5) located onthe opposite side of the boat hull.

Various of the features of the invention are set forth in the followingclaims.

lclaim:

1. A marine propulsion device comprising a propulsion unit including afirst part having a projecting portion, a gearcase, and a propellershaft rotatably supported in said gearcase, said propulsion unit alsoincluding a second part including first and second portions with saidsecond portion rotatably receiving therein said projecting portion ofsaid first part, a structure including a part adapted to extend inwardlyrelative to the transom of a boat and including means for rotatablysupporting said propulsion unit second part for vertical swingingmovement about a generally horizontal tilt axis and with said secondpropulsion unit part having said first portion extending on one side ofsaid structure and said second portion extending on the other side ofsaid structure and said projecting portion of said first part extendingfor rotation about an axis transverse to said horizontal axis, a driveshaft coaxial with said transverse axis and extending through saidpropulsion unit, means for connecting said drive shaft to said propellershaft, and means movably mounted on said first portion of saidvertically swingable propulsion unit second part and connected to saidprojecting portion of said first part for rotating said first part aboutsaid transverse axis to afford steering of said first part.

2. A propulsion device in accordance with claim 1, wherein said meansfor rotatably supporting said propulsion unit for swinging movementabout a horizontal tilt axis comprises a support adapted to be connectedto a boat transom, said support having opposed spaced sidewalls, saidsidewalls having first and second coaxial apertures, a first memberhaving a portion journaled within said first aperture, a second memberhaving a portion joumaled in said second aperture, and means connectingsaid members to said second part for affording rotation of said secondpart about a horizontal tilt axis coaxial with said axis of said firstand second apertures.

3. A propulsion device in accordance with claim 2, wherein said portionsof said first and second members journaled in said apertures aresymmetrical and interchangeably interfit in each of said apertures.

4. A propulsion device in accordance with claim 2, including a steeringshaft rotatably supported in one of said first and second members, asteering arm on said shaft, said steering arm extending transversely tosaid shaft and connectable to a remote steering arrangement, and meansconnecting said shaft to said projecting portion of said first part.

5. A propulsion device in accordance with claim 4, wherein said meansconnecting said steering shaft to said projecting portion of said firstpart comprises a pulley on said shaft and a pulley on said projectingportion and an endless band reeved on said pulleys.

6. A device in accordance with claim 4, wherein said means connectingsaid steering shaft to said projecting portion comprises a gear segmenton said steering shaft, a gear segment on said projecting portion, andan intermediate gear in mesh with said gear on said steering shaft andsaid gear on said projecting portion.

7. A propulsion device in accordance with claim 2, includ ing an enginewith an output shaft, and means for mounting one part of said engine tosaid propulsion unit so as to afford a plurality of engine-mountingpositions in planetary relation to said horizontal tilt axis and withsaid engine output shaft being rotatable about a generally horizontalaxis parallel to said horizontal tilt axis of said propulsion unit.

8. A propulsion device in accordance with claim 7, wherein said meansfor mounting said engine in said propulsion unit to afford a pluralityof mounting positions comprises a first mounting member, means forsecuring said first mounting member to said support to afford aplurality of selective mounting positions of said first mounting memberabout said horizontal tilt axis, a second mounting member, means forsecuring said second mounting member in overlapping relation to saidfirst mounting member and in planetary relation to said horizontal axisto afford a plurality of positions of said second mounting member withrespect to said first mounting member.

9. A propulsion device in accordance with claim 8 wherein said means forsecuring said first mounting member to said support comprises aplurality of circumferentially spaced apertures in said first member,bolts which extend through said apertures and are engageable with saidsupport, and wherein said means for securing said second support memberto said first support member comprises a plurality of circumferentiallyarranged apertures, and bolts extendable through said apertures in saidsecond mounting member and receivable in apertures in said firstmounting member.

10. A propulsion device in accordance with claim 7, including means foradjustably supporting another part of said engine to a transom.

11. A device in accordance with claim 10, wherein said means foradjustably mounting another part of said engine to said transomcomprises a bracket adapted to be secured to a transom, said bracketincluding a guideway, a slide movable in said guideway, said slideincluding a resilient engine mount provided with a projecting studengageable with said engine, and means for securing said slide to saidbracket.

12. Apparatus for prealigning a rear engine mounting bracket comprisinga stub shaft having a coaxial opening, said stub shaft being adapted forcoaxial connection with an engine output shaft, an engine-mountingbracket having an aperture adapted to receive a projecting stud from anengine mount and an alignment rod having one end adapted to project intosaid aperture in said stub shaft, and a second end adapted to projectinto said aperture in said bracket when said aperture in said bracket iscoaxially aligned with said aperture in said stub shaft.

13. A boat hull having a transom with an opening in combination with amarine propulsion device comprising a drive shaft housing, said driveshaft housing extending through said opening in said transom, said driveshaft housing including upper and lower housing sections, said lowersection being rotatably connected to said upper housing section, aprojecting portion on said lower housing section extending through saidupper housing section, a drive shaft rotatably supported in said driveshaft housing, a fixed housing secured to said transom and located onthe inboard side of said transom, said fixed housing having opposedspaced sidewalls, first and second coaxial apertures in said sidewalls,a first bushing located in said first aperture and a second bushinglocated in said second aperture, said bushings being secured to theupper end of said upper housing section, a cross-shaft rotatablysupported in said bushings for rotation about an axis coaxial to saidaxis of said first and second apertures, one of said bushings includinga transverse steering shaft rotatably supported in said bushing forrotation about an axis parallel to said drive shaft, a pulley on saidsteering shaft, a pulley on said projecting portion, a belt connectingsaid pulleys, an engine, a first engine-mounting member having aplurality of circumferentially arranged apertures, bolts securing saidfirst enginemounting member to said fixed housing, a secondenginemounting member having a resilient mount connected to one end ofsaid engine, a plurality of circumferentially arranged apertures in saidsecond mounting member and bolts extending through said apertures insaid second mounting member and threadable in some of said apertures insaid first mounting member, and means for adjustably supporting theother end of said engine to said transom.

M, A marine propulsion device adapted for support on a boat adjacent thetransom thereof, said device comprising a propulsion unit includingfirst part including a gearcase and a projecting portion, saidpropulsion unit also including a second part having a hollow interiorwhich rotatably supports said projecting portion about an axis forpivotal steering movement, means for rotatably supporting saidpropulsion unit second part on a transom for vertical swinging movementabout a generally horizontal tilt axis transverse to said steeringmovement axis and with a portion of said second part extending forwardlyof the transom within a boat, and means movably swingably mounted onsaid vertically tiltable portion of said second propulsion unit partlocated forwardly of the transom and connected to said projectingportion of said first part for pivoting said first part about saidsteering movement axis.

15. A marine propulsion device in accordance with claim 14, wherein saidmeans for rotatably supporting said propulsion unit for verticalswinging movement about a horizontal tilt axis comprises a supportadapted to be connected to a boat transom, a hydraulic cylinder having apiston rod with one of said cylinder and said piston rod being connectedto said second part and the other of said piston and said cylinder beingconnected to said support.

16. A marine propulsion device comprising a propulsion unit, saidpropulsion unit including a first part having an axial extension, asecond part having a hollow interior, said axial extension beingjournaled in said hollow interior of said second part and a support forrotatably supporting said propulsion unit for swinging movement in avertical plane about a generally horizontal tilt axis, said supportincluding opposed spaced walls defining a cavity therebetween andwherein said axial extension of said first part projects into saidcavity within said hollow interior of said second part, and meansconnected to said axial extension in said cavity to afford rotation ofsaid first part about an axis transverse to the horizontal tilt axis.

17. A marine propulsion unit in accordance with claim 16, including awater intake tube, a water pump including a pump body, flexible drivemeans connected to said water pump, and means swingably mounting saidwater pump body to said intake tube to afford movement of said pump totighten said drive means.

18. The assembly of a boat hull having a transom, a marine propulsiondevice comprising a propulsion unit, means for rotatably supporting saidpropulsion unit on said boat hull for vertical swinging movementrelative to said boat hull about a generally horizontal tilt axis, anengine having an output shaft, and means for mounting said engine onsaid means for rotatably supporting said propulsion unit to afford aplurality of engine-mounting positions in planetary relation to saidhorizontal tilt axis with said output shaft parallel to said horizontaltilt axis.

19. An assembly in accordance with claim 18, wherein said engine ismounted on one of the port and starboard sides of said boat hull and abattery mounted on the other of said port or starboard sides of saidhull to counterbalance said engine.

1. A marine propulsion device comprising a propulsion unit including afirst part having a projecting portion, a gearcase, and a propellershaft rotatably supported in said gearcase, said propulsion unit alsoincluding a second part including first and second portions with saidsecond portion rotatably receiving therein said projecting portion ofsaid first part, a structure including a part adapted to extend inwardlyrelative to the transom of a boat and including means for rotatablysupporting said propulsion unit second part for vertical swingingmovement about a generally horizontal tilt axis and with said secondpropulsion unit part having said first portion extending on one side ofsaid structure and said second portion extending on the other side ofsaid structure and said projecting portion of said first part extendingfor rotation about an axis transverse to said horizontal axis, a driveshaft coaxial with said transverse axis and extending through saidpropulsion unit, means for connecting said drive shaft to said propellershaft, and means movably mounted on said first portion of saidvertically swingable propulsion unit second part and connected to saidprojecting portion of said first part for rotating said first part aboutsaid transverse axis to afford steering of sAid first part.
 2. Apropulsion device in accordance with claim 1, wherein said means forrotatably supporting said propulsion unit for swinging movement about ahorizontal tilt axis comprises a support adapted to be connected to aboat transom, said support having opposed spaced sidewalls, saidsidewalls having first and second coaxial apertures, a first memberhaving a portion journaled within said first aperture, a second memberhaving a portion journaled in said second aperture, and means connectingsaid members to said second part for affording rotation of said secondpart about a horizontal tilt axis coaxial with said axis of said firstand second apertures.
 3. A propulsion device in accordance with claim 2,wherein said portions of said first and second members journaled in saidapertures are symmetrical and interchangeably interfit in each of saidapertures.
 4. A propulsion device in accordance with claim 2, includinga steering shaft rotatably supported in one of said first and secondmembers, a steering arm on said shaft, said steering arm extendingtransversely to said shaft and connectable to a remote steeringarrangement, and means connecting said shaft to said projecting portionof said first part.
 5. A propulsion device in accordance with claim 4,wherein said means connecting said steering shaft to said projectingportion of said first part comprises a pulley on said shaft and a pulleyon said projecting portion and an endless band reeved on said pulleys.6. A device in accordance with claim 4, wherein said means connectingsaid steering shaft to said projecting portion comprises a gear segmenton said steering shaft, a gear segment on said projecting portion, andan intermediate gear in mesh with said gear on said steering shaft andsaid gear on said projecting portion.
 7. A propulsion device inaccordance with claim 2, including an engine with an output shaft, andmeans for mounting one part of said engine to said propulsion unit so asto afford a plurality of engine-mounting positions in planetary relationto said horizontal tilt axis and with said engine output shaft beingrotatable about a generally horizontal axis parallel to said horizontaltilt axis of said propulsion unit.
 8. A propulsion device in accordancewith claim 7, wherein said means for mounting said engine in saidpropulsion unit to afford a plurality of mounting positions comprises afirst mounting member, means for securing said first mounting member tosaid support to afford a plurality of selective mounting positions ofsaid first mounting member about said horizontal tilt axis, a secondmounting member, means for securing said second mounting member inoverlapping relation to said first mounting member and in planetaryrelation to said horizontal axis to afford a plurality of positions ofsaid second mounting member with respect to said first mounting member.9. A propulsion device in accordance with claim 8 wherein said means forsecuring said first mounting member to said support comprises aplurality of circumferentially spaced apertures in said first member,bolts which extend through said apertures and are engageable with saidsupport, and wherein said means for securing said second support memberto said first support member comprises a plurality of circumferentiallyarranged apertures, and bolts extendable through said apertures in saidsecond mounting member and receivable in apertures in said firstmounting member.
 10. A propulsion device in accordance with claim 7,including means for adjustably supporting another part of said engine toa transom.
 11. A device in accordance with claim 10, wherein said meansfor adjustably mounting another part of said engine to said transomcomprises a bracket adapted to be secured to a transom, said bracketincluding a guideway, a slide movable in said guideway, said slideincluding a resilient engine mount provided with a projecting studengageable with said engine, and means for securing said slide to sAidbracket.
 12. Apparatus for prealigning a rear engine mounting bracketcomprising a stub shaft having a coaxial opening, said stub shaft beingadapted for coaxial connection with an engine output shaft, anengine-mounting bracket having an aperture adapted to receive aprojecting stud from an engine mount and an alignment rod having one endadapted to project into said aperture in said stub shaft, and a secondend adapted to project into said aperture in said bracket when saidaperture in said bracket is coaxially aligned with said aperture in saidstub shaft.
 13. A boat hull having a transom with an opening incombination with a marine propulsion device comprising a drive shafthousing, said drive shaft housing extending through said opening in saidtransom, said drive shaft housing including upper and lower housingsections, said lower section being rotatably connected to said upperhousing section, a projecting portion on said lower housing sectionextending through said upper housing section, a drive shaft rotatablysupported in said drive shaft housing, a fixed housing secured to saidtransom and located on the inboard side of said transom, said fixedhousing having opposed spaced sidewalls, first and second coaxialapertures in said sidewalls, a first bushing located in said firstaperture and a second bushing located in said second aperture, saidbushings being secured to the upper end of said upper housing section, across-shaft rotatably supported in said bushings for rotation about anaxis coaxial to said axis of said first and second apertures, one ofsaid bushings including a transverse steering shaft rotatably supportedin said bushing for rotation about an axis parallel to said drive shaft,a pulley on said steering shaft, a pulley on said projecting portion, abelt connecting said pulleys, an engine, a first engine-mounting memberhaving a plurality of circumferentially arranged apertures, boltssecuring said first engine-mounting member to said fixed housing, asecond engine-mounting member having a resilient mount connected to oneend of said engine, a plurality of circumferentially arranged aperturesin said second mounting member and bolts extending through saidapertures in said second mounting member and threadable in some of saidapertures in said first mounting member, and means for adjustablysupporting the other end of said engine to said transom.
 14. A marinepropulsion device adapted for support on a boat adjacent the transomthereof, said device comprising a propulsion unit including first partincluding a gearcase and a projecting portion, said propulsion unit alsoincluding a second part having a hollow interior which rotatablysupports said projecting portion about an axis for pivotal steeringmovement, means for rotatably supporting said propulsion unit secondpart on a transom for vertical swinging movement about a generallyhorizontal tilt axis transverse to said steering movement axis and witha portion of said second part extending forwardly of the transom withina boat, and means movably swingably mounted on said vertically tiltableportion of said second propulsion unit part located forwardly of thetransom and connected to said projecting portion of said first part forpivoting said first part about said steering movement axis.
 15. A marinepropulsion device in accordance with claim 14, wherein said means forrotatably supporting said propulsion unit for vertical swinging movementabout a horizontal tilt axis comprises a support adapted to be connectedto a boat transom, a hydraulic cylinder having a piston rod with one ofsaid cylinder and said piston rod being connected to said second partand the other of said piston and said cylinder being connected to saidsupport.
 16. A marine propulsion device comprising a propulsion unit,said propulsion unit including a first part having an axial extension, asecond part having a hollow interior, said axial extension beingjournaled in said hollow interior of saiD second part and a support forrotatably supporting said propulsion unit for swinging movement in avertical plane about a generally horizontal tilt axis, said supportincluding opposed spaced walls defining a cavity therebetween andwherein said axial extension of said first part projects into saidcavity within said hollow interior of said second part, and meansconnected to said axial extension in said cavity to afford rotation ofsaid first part about an axis transverse to the horizontal tilt axis.17. A marine propulsion unit in accordance with claim 16, including awater intake tube, a water pump including a pump body, flexible drivemeans connected to said water pump, and means swingably mounting saidwater pump body to said intake tube to afford movement of said pump totighten said drive means.
 18. The assembly of a boat hull having atransom, a marine propulsion device comprising a propulsion unit, meansfor rotatably supporting said propulsion unit on said boat hull forvertical swinging movement relative to said boat hull about a generallyhorizontal tilt axis, an engine having an output shaft, and means formounting said engine on said means for rotatably supporting saidpropulsion unit to afford a plurality of engine-mounting positions inplanetary relation to said horizontal tilt axis with said output shaftparallel to said horizontal tilt axis.
 19. An assembly in accordancewith claim 18, wherein said engine is mounted on one of the port andstarboard sides of said boat hull and a battery mounted on the other ofsaid port or starboard sides of said hull to counterbalance said engine.